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Hernandez to undergo Tommy John surgery

PHOENIX -- D-backs reliever David Hernandez is headed for Tommy John surgery.

Hernandez saw Dr. James Andrews on Monday and Andrews confirmed what team physician Michael Lee diagnosed last week -- Hernandez has a tear in his ulnar collateral ligament.

Hernandez will have the surgery performed by Andrews on Tuesday and will be lost for the entire 2014 season.

"It's disappointing, but we have to regroup," D-backs manager Kirk Gibson said when Hernandez was first diagnosed. "I don't have an answer for who will be there, but we do have some guys with experience in the back end. Our bullpen will have a different dynamic, but it's just another opportunity for someone else. We still have a lot of good choices."